Just briefly, you can keep them at bay with the simple standard Wiccan cleansing ritual.
Here's a page with some simple cleansing in it:
www.lunarace.com... (just do the room cleansing... don't bother with the other
rituals.)
Now, that one's brief and will do for most situations. If you're being bothered by obsessive thoughts, THIS one (which goes into meditating
(thinking deeply) about the properties of earth, water, air, and fire) may be a better solution -- but don't try it till you've tried the first
one:
www.isisbooks.com...
Lastly, I'd suggest you change your reading material. Read positive, humorous stuff (Dave Barry, or any of the "Chicken Soup" series or Doc Savage
(the old novels are fun reads) or Tarzan... or C.S. Lewis' Narnia series or Harry Potter... or ANYTHING that followis these rules:
1) Positive ending. Good guys win. Bad guys lose. Fiction or biographies. The funnier, the better.
2) No Focus On ANGST. Avoid Tony Hellerman and "dark psychological mystery" writers and read Agatha Christie (focus is on mystery, not on
detective's personal failings and pain or on the Evil Thoughts of the bad guy.) Read Janet Evanovich -- her bumbling detective, Stephanie Plum, will
keep you in stitches.
3) Characters that act, rather than sitting around and waiting for a Great Cosmic Whatever to make life better. Andre Norton's "Witch World"
series... heck, any of her books... were good for this. And Terry Pratchett is a balm for most troubled souls.
Comedies... movies, cartoons, comic books. Stay away from the dark stuff (you can move back to it later) and focus on stories that are about triumph.
Things that let you look around and appreciate that the world is a real decent place and there's lots of wonderful folks around.
These entities breed when you're down or depressed or are brooding over something or when you see the world as an evil and dark place, full of vile
people. Humorous stories (a good Amelia Peabody Egyptian mystery) with action and adventure and the good guys winning in the end are the best
demon-chasers.
The world becomes what you think it is. If you envision a dark and ugly, demon-haunted world, those ugly mind-demons will be around you forever.
Change that aspect, and they become weak, powerless... and they fade.